Related Questions

A ferrite core has less eddy current loss than an iron core because
A Ferrites have high resistance
B Ferrites are magnetic
C Ferrites have low permeability
D Ferrites have high hysteresis
The applied voltage of a certain transformer is increased by 50%, while the frequency is reduced by 50%. The maximum core flux density will
A become three times
B become 1.5 times
C become half
D remian the same
What is the purpose of providing an iron core in a transformer?
A Provide support to windings
B Reduce hysteresis loss
C Decrease the reluctance of the magnetic path
D Reduce eddy current losses
The purpose of providing an iron core in a transformer is to
A provide support to windings
B reduce hysteresis loss
C decrease the reluctance of the magnetic path
D reduce eddy current losses
The core used in high frequency transformer is usually
A copper core
B cost iron core
C air core
D mild steel core
A transformer core is laminated to
A reduce hysteresis loss
B reduce eddy current losses
C reduce copper losses
D reduce all above losses
The purpose of providing iron core in a step-up transformer is
A To provide coupling between primary and secondary
B To increase the magnitude of mutual flux
C To decrease the magnitude of magnetizing current
D To provide all above features
Which of the following property is not necessarily desirable in the material for transformer core?
A Mechanical strength
B Low hysteresis loss
C High thermal conductivity
D High permeability
Which of the following properties is not necessarily desirable for the material for transformer core?
A Low hysteresis loss
B High permeability
C High thermal conductivity
D Adequate mechanical strength
Reduction in core losses and increase in permeability are obtained with transformer employing
A core built-up of laminations of cold rolled grain oriented steel
B core built-up of laminations of hot rolled sheet
C either of the above
D none of the above

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